Would you like me to show you our new cleaning unit ? It's a clever design .   Yes , I'd like to see that . What does it clean exactly ?   It washes the solvent off all the metal parts - the blades , trays etc . - and then sends it back into the system .   What does the unit consist of ?   Well , it's basically two tanks – one for the dirty solvent and one for the clean solvent , a pump and a washing unit . Oh , and there ’ s a cooling system and a filter . It's all controlled by a PLC system – that stands for Process Logic Control . 